A new Web Publishing Guide has been released for Australian Government (ie: Commonwealth) agencies. This covers legal and policy requirements, as well as accessibility and some technical standards. This consolidates the content of a number of previously separate guides, without adding any new mandatory requirements.
The new guide practices what it preaches with a new clean, efficient XHTML and CSS standards based web site. There is minimal, but effective use of graphics on the web pages, such as the use of arrow icons to indicate external links and tick box icons for mandatory items.
However, some of the guidance is unclear. The accessibility page gives a good overview of issues with access to the web by the disabled. But while the page is marked as as "Mandatory" it does not state exactly which one of the three levels of compliance in the cited W3C Web Content Accessibility Guidelines is required for government agencies. I would guess it is Level AA (Priority 2). However, in the absence of an explicit statement, some agencies may only meet the far less stringent Level A (Priority 1) of the standard or waste effort unnecessarily trying for Level AAA (Priority 3).